There were two types of cultivation paths in this era, internal and external cultivation. Internal cultivation involves the absorption of Qi within a person’s Dantian, while external cultivation involves the strengthening of the physical body.
Cultivation methods of the Internal Cultivation path in the Four Physical Realms were split into Low-tier, Mid-tier, High-tier, and Peak-tier Techniques.
One should also note that internal cultivation methods allow someone to cultivate by adsorbing one of the Six Elemental Qi in the surroundings.
As for External Cultivation methods, those are usually martial arts techniques that tampers the physical body. Those that were used in the Four Physical Realms were separated into levels from weakest to strongest, Black Grade, Bronze Grade, Silver Grade, and Gold Grade. And they can further be sub-divided into Low-class, Mid-class, High-class.